const fs = require('fs')
const path = require('path')
const _ = require('lodash')
const sander = require('sander')

function copyImage (filePath, storageKey) {
  const targetStorage = (() => {
    try {
      const cachedStorageList = JSON.parse(localStorage.getItem('storages'))
      if (!_.isArray(cachedStorageList)) throw new Error('Target storage doesn\'t exist.')

      const storage = _.find(cachedStorageList, {key: storageKey})
      if (storage == null) throw new Error('Target storage doesn\'t exist.')
      return storage
    } catch (e) {
      return Promise.reject(e)
    }
  })()

  return new Promise((resolve, reject) => {
    try {
      const inputImage = fs.createReadStream(filePath)
      const imageName = path.basename(filePath)
      sander.mkdirSync(`${targetStorage.path}/images`)
      const outputImage = fs.createWriteStream(path.join(targetStorage.path, 'images', imageName))
      inputImage.pipe(outputImage)
      resolve(`${encodeURI(targetStorage.path)}/images/${encodeURI(imageName)}`)
    }
    catch(e) {
      return reject(e)
    }
  })
}

module.exports = copyImage